Script to update an EC2 instance with an elastic IP.

associate_eip_address.py

#!/usr/bin/env python
import boto3
import requests

def main(argv):
	instance_id = requests.get('http://169.254.169.254/latest/meta-data/instance-id').text
	allocation_id = argv[1]
	client = boto3.client('ec2')
	response = client.associate_address(InstanceId=instance_id,AllocationId=allocation_id)

if __name__ == "__main__":
	main(sys.argv)